21296973 has 8 divisors (see below), whose sum is σ = 28424736. Its totient is φ = 14183600.

The previous prime is 21296939. The next prime is 21296981. The reversal of 21296973 is 37969212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21296973 - 2⁶ = 21296909 is a prime.

It is a super-2 number, since 2×21296973² = 907122117925458, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21296983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (3553092).

Almost surely, 2^21296973 is an apocalyptic number.

It is an amenable number.

21296973 is a deficient number, since it is larger than the sum of its proper divisors (7127763).

21296973 is a wasteful number, since it uses less digits than its factorization.

21296973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7195.

The product of its digits is 40824, while the sum is 39.

The square root of 21296973 is about 4614.8643533694. The cubic root of 21296973 is about 277.1868523423.

The spelling of 21296973 in words is "twenty-one million, two hundred ninety-six thousand, nine hundred seventy-three".